Means for controlling the flow of elastic fluid in turbines



Jan. 11 1927. 1,613,868

R. BIRMANN MEANS FOR CONTROLLING THE FLOW OF ELASTIC FLUID IN TURBINESFiled Feb. 15. 1926 Patented Jan. 11, 1927.

UNITED STATES PATENT OFFICE.

RUDOLPH BIB/MANN, OF TREN TON, NEW JERSEY, ASSIGNOR TO THE DE LAVALSTEAM TURBINE COMPANY, OF TRENTON, NEW JERSEY, A CORPORATION OF NEWJERSEY.

MEANS FOR CONTROLLING THE FLOW OF ELASTIC FLUID IN TURBINES.

Application filed February 13, 1926.

My invention relates to means for con- .trolling the flow of elasticfluid in turbines and more particularly in turbines of the bleeder type.

The object of my invention, is primarily to provide means forcontrolling the flow of, usually, a large volume of steam in a simpler,more economical and accurate manner.

My invention from the broad standpoint consists in the provision, withinthe casing of a turbine, of a double or multi-flow valve preferably ofthe partially or fully balanced type and so positioned that the cent-erline of the valve and the center line of the turbine rotor aresubstantially coincident.

More particularly my invention consists in providing valve seats on thediaphragm to which the steam flow has to be regulated and in supportingthe valve from the diaphragm, the diaphragm being so shaped to admit thesteam, which passes through the valve, guide it to the nozzle inlet anddischarge it through the nozzles.

Having now indicated in a general way the nature and purpose of myinvention, I will now proceed to a detailed description thereofWithreference to the accompanying drawing in which there is illustrateda prei'erred embodiment and in which The Fig. 1 is a sectional view of aportion of a turbine ot' the bleeder type embodying my invention, andFig. 2 is a detail.

In the drawing a indicates the casing of the turbine and b the rotorshaft. 0 indicates the wheel of the last stage above the steamextraction point and (Z the wheel of the first stage after the steamextraction point, while 6 indicates a diaphragm associated with thewheel d. In the turbine illustrated, the steam is bled from the spaceThe steam from space 7 entering the stage including the. wheel (Z iscontrolled by a valve g, having double seat faces g adapted to cooperatewith valve seats h formed on diaphragm e in which is formed a passage 2'which guides the steam passing through the valve to nozzles y.

The valve 9, which is circular, is mounted on the hub 72 of diaphragm eand is retained thereon, as well as made longitudinally movable foropening and closing, by engagement with a very coarse thread Z cut onthe hub.

The opening and closing of the valve is eiiected by its rotation on thethread Z which Serial No. 88,051.

is accomplished through the medium of a lever m operated through a rod12, it being observed that due to the coarseness of the thread only afraction of a revolution is rotor, a diaphragm having a pair of valveseats formed thereon, a circular balanced valve adapted to cooperatewith said seats and positioned within the casing with its center insubstantial coincidence with the axis of rotation of the rotor.

3. In a turbine including a casing, a rotor and a diaphragm, a valveseat carried by the diaphragm, a valve positioned adjacent saiddiaphragm on an axis substantially coincident with the axis of the rotorand having a movement into open and closed position in a directionlongitudinal of its axis.

4:. In a turbine including a casing, a rotor, a diaphragm, a pair ofvalve seats carried by the diaphragm, a passage formed in the diaphragmbetween said seats, a circular valve adjacent the diaphragm having facesadapted to cooperate with said valve seats for the control of saidpassage and means for imparting to said valve a movement in a directionaxial of said rotor.

5. In a turbine including a casing, a rotor, a diaphragm, a hub formedon the diaphragm, a helix formed on the hub, a pair of valve seatscarried by the diaphragm, a passage formed in the diaphragm between saidseats for the distribution of steam, a circular valve supported on saidhub, said valve having faces adapted to cooperate with said valve seatsfor control of the passage of steam into said passages and having acentral aperture within which is formed a helical groove for thereception of said helix and means for rotating said valve relative tosaid helix whereby said valve will be moved axially of said hub.

In testimony of which invention, I have hereunto set my hand, atTrenton, N. J., on this 8th day of February, 1926.

RUDOLPH BIRMANN.

